xantia rear brake excessive fluctuation
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xantia rear brake excessive fluctuation
My question regarding an MOT failure for rear brake excessive fluctuation is, if the rear height corrector cylinder is not good (permits sinking) would this affect braking efficiency and balance?
Its a Xantia MK 2
Its a Xantia MK 2
John Plum
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Re: xantia rear brake excessive fluctuation
No, not when the engine is running John...
I suspect you have the old familiar 'wedging' problem and need to overhaul your calipers... There are plenty of threads about this very subject and the precautions to be taken..
Have a look at this thread to gain an idea of how to remove the caliper bolts safely and how to clean up any corrosion...
https://www.frenchcarforum.co.uk/forum/ ... hp?t=31410
I suspect you have the old familiar 'wedging' problem and need to overhaul your calipers... There are plenty of threads about this very subject and the precautions to be taken..
Have a look at this thread to gain an idea of how to remove the caliper bolts safely and how to clean up any corrosion...
https://www.frenchcarforum.co.uk/forum/ ... hp?t=31410
Jim
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Re: xantia rear brake excessive fluctuation
This is the first thread I posted on, with the same issue. It also has decent photographs clearly showing what the problem is;
https://www.frenchcarforum.co.uk/forum/ ... =3&t=38467
https://www.frenchcarforum.co.uk/forum/ ... =3&t=38467
James
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Re: xantia rear brake excessive fluctuation
Muchos Grathias gentlemen
I did a complete overhaul a couple of years ago. But I'l be taking a close look to see how they have fared. Possibly jus need bleeding and re-greasing on the slide. I had used copper slip, but I'm thinking they need something better.... whatever that might be. They started to squeal.
I did a complete overhaul a couple of years ago. But I'l be taking a close look to see how they have fared. Possibly jus need bleeding and re-greasing on the slide. I had used copper slip, but I'm thinking they need something better.... whatever that might be. They started to squeal.
John Plum
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Re: xantia rear brake excessive fluctuation
James, thanks for posting up that link I was looking for it but could not find it... I must 'SuperSticky' it now it's found again...
John, when you last overhauled the rears did you replace the thin tin covers over the calipers? I ask as I've seen them discarded in the past and that's a recipe for lots of road crud to contaminate things badly...
John, when you last overhauled the rears did you replace the thin tin covers over the calipers? I ask as I've seen them discarded in the past and that's a recipe for lots of road crud to contaminate things badly...
Jim
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Re: xantia rear brake excessive fluctuation
Ah well, Jim, thats a very good question:
I did everything, even red oxide on the cleaned-up metal, and used a paper gasket, But: Replace those tin covers? No. The sheer time delay and hell of getting them on an awkward journey.... I felt bad about it at the time, but managed to forget about it.
Do you reckon they are even available?
I did everything, even red oxide on the cleaned-up metal, and used a paper gasket, But: Replace those tin covers? No. The sheer time delay and hell of getting them on an awkward journey.... I felt bad about it at the time, but managed to forget about it.
Do you reckon they are even available?
Last edited by John Plum on 14 Nov 2016, 21:34, edited 1 time in total.
John Plum
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Re: xantia rear brake excessive fluctuation
BTW, you shouldn't use copperslip or similar metal-loaded grease on any joints that move in normal operation, as it is slightly abrasive and will cause wear.
You also shouldn't use on brake calipers, as it is not temperature stable, and when the brakes get hot, it will run and contaminate the pads (which could be your current problem).
You also shouldn't use on brake calipers, as it is not temperature stable, and when the brakes get hot, it will run and contaminate the pads (which could be your current problem).
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Re: xantia rear brake excessive fluctuation
The other problem with using a metal based grease is that the corrosion is caused by an electrolytic reaction between the metal of the calliper and the training arm, and adding a third metal to the mix may well make things worse. I have considered putting a thin piece of plastic between the arm and calliper, to act as a shield between them.
Euro Car Parts do have those rear brake kits available, and are not expensive (under £10 for both sides), but I would check the kit before leaving the store. The first one I bought had a split in the bag, and a few bits were missing. The salesman agreed that this was not my fault, ordered another set, and checked it personally when it came in.
http://www.eurocarparts.com/ecp/c/Citro ... 30c&000416
Euro Car Parts do have those rear brake kits available, and are not expensive (under £10 for both sides), but I would check the kit before leaving the store. The first one I bought had a split in the bag, and a few bits were missing. The salesman agreed that this was not my fault, ordered another set, and checked it personally when it came in.
http://www.eurocarparts.com/ecp/c/Citro ... 30c&000416
James
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ex BX 1.9
ex Xantia 2.0HDi SX
ex Xantia 2.0HDi LX
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Yes, I am paranoid, but am I paranoid ENOUGH?
Out amongst the stars, looking for a world of my own!
Re: xantia rear brake excessive fluctuation
I cut a paper gasket, spread it with grease, and used that. Worked nicely. Now poised to re-inspect after two years...Hell Razor5543 wrote:The other problem with using a metal based grease is that the corrosion is caused by an electrolytic reaction between the metal of the calliper and the training arm, and adding a third metal to the mix may well make things worse. I have considered putting a thin piece of plastic between the arm and calliper, to act as a shield between them.
John Plum
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Re: xantia rear brake excessive fluctuation
Would be nice to see the strip down photos to see the results of that.John Plum wrote:I cut a paper gasket, spread it with grease, and used that. Worked nicely. Now poised to re-inspect after two years...Hell Razor5543 wrote:The other problem with using a metal based grease is that the corrosion is caused by an electrolytic reaction between the metal of the calliper and the training arm, and adding a third metal to the mix may well make things worse. I have considered putting a thin piece of plastic between the arm and calliper, to act as a shield between them.
Alasdair
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Re: xantia rear brake excessive fluctuation
Here you are then: a link to my previous overhaul, with gasket visible in pictures:
https://www.frenchcarforum.co.uk/forum/ ... 19#p425819
https://www.frenchcarforum.co.uk/forum/ ... 19#p425819
John Plum
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Re: xantia rear brake excessive fluctuation
John, that's valuable link back to a valuable thread on this subject
Very interesting comments on the use of copper grease, thanks for that. Stuff I was unaware of...
Very interesting comments on the use of copper grease, thanks for that. Stuff I was unaware of...
Jim
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Re: xantia rear brake excessive fluctuation
I do this every year just to check on the brake condition. But I found that greaseproof paper was only lasting one year and needed replacement each time. Someone on the forum suggested the thick black damproof plastic membrane. I've used that for nearly 3 years with no problem. The easiest way to ascertain whether you have a problem with the back brakes is to jack each side up in turn and give the wheels a good turn.. they should turn with hardly any resistance and rotate at least 3 or 4 times before stopping. If they don't you need to strip the brakes.
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Re: xantia rear brake excessive fluctuation
Ive inspected the 1mm gasket paper (greased) - its fine. Your spin check is a good one. mine are not spinning nicely , unlike when when I last re-fitted them with all new pads and discs. Although I cleaned ups and greased the pins and edges nicely at that time, I think it probably needed new pins. I'm about to take off the pads now to inspect them.c.morewood wrote: The easiest way to ascertain whether you have a problem with the back brakes is to jack each side up in turn and give the wheels a good turn.. they should turn with hardly any resistance and rotate at least 3 or 4 times before stopping. If they don't you need to strip the brakes.
John Plum
Xantia II Estate,1999, 2.0 HDI LX, 17000 miles, manual
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Re: xantia rear brake excessive fluctuation
Well, ECP do sell the rear brake kits, with the covers, springs and all.
James
ex BX 1.9
ex Xantia 2.0HDi SX
ex Xantia 2.0HDi LX
Ex C5 2.0HDi VTR
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Yes, I am paranoid, but am I paranoid ENOUGH?
Out amongst the stars, looking for a world of my own!
ex BX 1.9
ex Xantia 2.0HDi SX
ex Xantia 2.0HDi LX
Ex C5 2.0HDi VTR
Ex C5 2.0HDi VTR
C5 2.2HDi VTX+
Yes, I am paranoid, but am I paranoid ENOUGH?
Out amongst the stars, looking for a world of my own!